Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
kiem soat » kiem toan
hieu soat » hieu suat, hieu hoat, hieu luat
van kiem » va kiem, van kien, van hien
quan san » quan sat, quan van, qua san
luan san » luan hoan, luan phan, luan nang
van hieu » cao hieu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van kiem soat ) OR ( tinh ((quan san) OR (luan san)) van hieu soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van kiem soat ) or ( tinh ((quan san) OR (luan san)) van hieu soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van kiem soat ) or ( tinh ((quan san) OR (luan san)) van hieu soat ))*.